Let (Xj, Yj), i = 1,..., be a sequence of independent and identically distributed random v...

Let (Xj, Yj), i = 1,..., be a sequence of independent and identically distributed random vectors. That is, X1,Y1is independent of, and has the same distribution as, X2, Y2, and so on. Although Xi and Yj can be dependent, Xi and Yj are independent when i ≠ j. Let

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